Stem blow-out prevention design
The valve stem and the ball are independent, one end of the valve stem close to the ball is designed into an integral T-shaped structure, and the gland flange blocks the T-shaped valve stem to prevent the T-shaped valve stem from being blown out by the pressure of the inner cavity.

阀杆防喷设计
阀杆和球体是独立的，阀杆靠近球体的一端设计成整体式 T 型结构，压盖法兰挡住 T 型阀杆，防止 T 型阀杆被内腔压力吹出。

Anti-static device
Anti-static device is the standard design of Zhenshun ball valve. The valve stem is equipped with a spring grounding plug to make the ball,the valve stem and the reading body contact to form a conductive circuit, which can transfer the electric charge, so as to avoid static electricity accumulation caused by friction when the valve is opened or closed or fluid impact on the inner cavity of the valve.This accumulation of static electricity is extremely dangerous for pipelines in some hazardous areas.

防静电装置
防静电装置是振顺球阀的标准设计。阀杆上装有弹簧接地插头，使球体、阀杆和读数体接触形成导电回路，可转移电荷，避免阀门启闭时摩擦或流体冲击阀门内腔造成静电积聚，这种静电积聚对某些危险区域的管道是极其危险的。

◆Super fireproof design 超强防火设计
1.Prevent leakage 防止泄漏
Under normal circumstances, the design of the graphite gasket of the double O-ring pressure cover can prevent leakage at the valve stem. The O-ring and the graphite gasket of the valve body also ensure the sealing of the valve body and the valve cover. When a fire occurs, the O-ring fails due to melting. At this time, the gland graphite gasket, the valve body graphite gasket and the valve stem graphite packing will assume the function of preventing fluid leakage.

在正常情况下，双 O 型环压盖的石墨垫片设计可以防止阀杆处的泄漏。阀体的 O 形圈和石墨垫片也保证了阀体和阀盖的密封。当发生火灾时，O 形圈因熔化而失效。此时，压盖石墨垫片、阀体石墨垫片和阀杆石墨填料将承担防止流体泄漏的作用。

2.Prevent internal leakage 防止内部泄漏
In the event of a fire, when non-metallic materials such as O-rings, soft seat rings and after the valve seat retainer ring is decomposed or melted, the metal seat ring lip of the second seal is springing. Under the action of the pre-tensioning force of the spring, it will push the ball to contact and block the pipeline fluid. To reduce the internal leakage in the valve channel. In addition, the flexible graphite seat ring packing is the same when the seat ring is compressed and sealed, the fluid leakage between the valve body and the valve seat is blocked.

在发生火灾时，当 O 形圈、软座圈、阀座挡圈等非金属材料分解或熔化后，第二道密封的金属座圈唇口产生弹性，在弹簧的预紧力作用下，推动球体接触并阻断管道流体，减少阀门通道内泄漏。此外，柔性石墨座圈填料在座圈受压密封时，可阻断阀体与阀座之间的流体泄漏。

◆Emergency grease injection device 应急注胶装置
The trunnion mounted ball valve of NPS6 (DN150) and above 6 inches, with injection seals on the stem and seat ring glue device. When the sealing material (seat seal ring or O-ring) is damaged or separated by fire or other accidents during solution, injecting sealant into the syringe can prevent leakage from the valve stem and seat ring. The device has a check valve acts as a back seal to prevent backflow.

NPS6（DN150）及 6 英寸以上规格固定球阀，阀杆与阀座均配备注胶密封装置。当密封件（阀座密封圈、O 形圈）在工况中受火灾或其他意外损毁、脱落后，可通过注油嘴注入密封剂，阻断阀杆、阀座圈处介质泄漏。装置内置单向止回阀，形成背封结构，防止介质倒流。

◆Double blocking and venting function 双阻断和排放功能
The Trunnion mounted ball valve valve seat can cut off the fluid from the inlet and outlet ends,so as to achieve double blocking functioncan. When the ball is in the fully open or fully closed position, even if both sides of the valve are pressurized at the same time, the center cavity and both ends of the valve. The channels blocked from each other, and the remaining medium in the middle cavity can be discharged through the relief valve.

固定球阀阀座可切断流体进出两端，实现双重阻断功能。当球体处于全开或全关位置时，即使阀门两侧同时加压，中心腔和阀门两端的通道也会相互阻断，中腔内的剩余介质可以通过泄压阀排出。

◆Self-discharge of middle cavity pressure 中腔压力自泄

When the middle cavity pressure (Pc) is less than the resultant force of seat ring spring preload (Fs) plus pipeline medium pressure (P1),
namely ΔP×D1 ＜ Fs,
the ball keeps tight contact with valve seat to maintain reliable sealing.

当中腔压力 Pc 产生的推力，小于座圈弹簧预紧力 Fs 与管道介质压力 P1 的合力（压差满足 ΔP×D1＜Fs）时，球体与阀座保持紧密贴合，实现可靠密封。

When the valve cavity pressure (Pc) makes ΔP×D1 > Fs (where Fs is the preload force of the seat ring spring, P1 is pipeline fluid pressure), the excess pressure from the middle cavity pushes the seat ring slightly open, forming a tiny clearance between the seat ring and the ball. The overpressure inside the middle cavity will be automatically released into the pipeline, until the pressure of valve middle cavity and upstream & downstream pipeline rebalance.

当阀腔压力（PC）大于座圈弹簧的预紧力（FS）和管路流体压力（P1），即 ΔP×D1＞FS 时，中腔压力推动座圈微开，使其与球体之间产生小间隙，从而自动释放阀腔内的过载压力，介质泄入管道，重新达到阀腔与管道（上下游）的压力平衡。

◆Self-relief valve seat (single piston effect valve seat) 自泄压阀座（单活塞效应阀座）

When acting, the upstream and downstream medium pressures push the valve seat to the ball, once the cavity pressure generated by the medium exceeds the sum of the spring preload and the medium pressure, the valve seat is pushed away from the ball by the cavity pressure. Thus, the excessive pressure generated in the middle chamber is automatically released in the fully open or fully closed position of the valve.

作用时，上游和下游端介质压力将阀座推向球体；一旦介质产生的中腔压力超过弹簧预紧力与介质压力之和时，阀座被中腔压力推离球体。从而中腔产生的过高压力，在阀门全开或全关位置，被自动释放。

Optional Structure 可选结构 2
◆Upstream self-relief valve seat, downstream piston action 上游自动泄压阀阀座，下游活塞动作
The upstream section adopts a self-relief valve seat design, and the medium pressure pushes the valve seat to the sphere to form a seal. When the pressure in the middle cavity is too high, the upstream self-relief valve seat can be pushed away from the ball, thereby automatically releasing the excessive pressure in the middle cavity to the upstream end. The downstream end adopts a double-piston valve seat design, the medium pressure always pushes the valve seat toward the ball, and the downstream valve seat keeps sealing.

上游段采用自卸阀座设计，介质压力将阀座推向球体形成密封，当中腔压力过高时，可将上游自卸阀座推离球体，从而自动将中腔过高的压力释放到上游端。下游端采用双活塞阀座设计，介质压力始终将阀座推向球体，下游阀座保持密封。

◆Double piston effect valve seat 双活塞效应阀座

The thrust generated by the pressure at the upstream and downstream ends always pushes the valve seat towards the sphere to protect maintain sealed state. The double-piston effect ball valve does not have the self-discharging function of the middle cavity, so it is under normal circumstances, the valve needs to install an automatic pressure relief valve on the valve body, and the pressure in the middle cavity is too high,the pressure can be released through the automatic pressure relief valve.

上、下游端压力产生的推力始终将阀座推向球面，以保护和保持密封状态。双活塞效应球阀不具备中腔自排功能，因此在正常情况下，阀门需要在阀体上安装自动泄压阀，而中腔压力过高，可以通过自动泄压阀释放压力。